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SHORT-TERM INVESTMENTS: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Short term investment: |  |  |  |  |
Trading securities | $ 675.3 |  | $ 675.3 |  | $ 245.2
Weighted average interest rate (as a percent) |  |  | 4.60% |  | 4.70%
Available-for-sale | 0.1 |  | $ 0.1 |  | $ 0.2
Weighted average interest rate (as a percent) |  |  | 0.80% |  | 0.90%
Total | 675.4 |  | $ 675.4 |  | $ 245.3
Trading: |  |  |  |  |
Interest earned | 7.2 | $ 7.6 | 9.5 | $ 13.7 |
Available-for-sale: |  |  |  |  |
Interest earned | 53.1 | 26.5 | 101.8 | 53.8 |
Maximum |  |  |  |  |
Available-for-sale: |  |  |  |  |
Interest earned | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1 |

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